Here is some information you might be interested in, but I'm not sure it applies to the PT wood sold today. I think that arsenic has been removed from PT wood in recent years, but there is still a lot of the old stuff around and that is most likely that someone would be wanting to dispose of.

Like any other pollutant in our environment, its a matter of concentration. If you burn PT wood outside, and don't stand in the way of the smoke, then the chemicals in the smoke will disperse over a wide area. The ash is a problem as it will be full of the chemicals. It is no longer bound up in the wood when the wood is burned. Now it has to be safely disposed of as a hazardous material. If you are an industry, then you have to meet EPA requirements, which means responsibility forever.

Here is some information you might be interested in, but I'm not sure it applies to the PT wood sold today. I think that arsenic has been removed from PT wood in recent years, but there is still a lot of the old stuff around and that is most likely that someone would be wanting to dispose of.

Like any other pollutant in our environment, its a matter of concentration. If you burn PT wood outside, and don't stand in the way of the smoke, then the chemicals in the smoke will disperse over a wide area. The ash is a problem as it will be full of the chemicals. It is no longer bound up in the wood when the wood is burned. Now it has to be safely disposed of as a hazardous material. If you are an industry, then you have to meet EPA requirements, which means responsibility forever.

This has thrown me completely in the RIGHT direction! Thanks. The first link contains information I cannot substantiate yet, but it seems more sensibly written than what I've found.